When a party proposes a name for appointment as sole arbitrator, the individual approached faces a threshold decision that shapes everything that follows in the proceeding. Unlike a member of a three-person tribunal, a sole arbitrator carries undivided responsibility for the outcome, and the moment of accepting appointment as sole arbitrator is where the twin obligations of independence and disclosure first come into play, well before a single procedural order is issued.
Independence and impartiality are not simply professional courtesies; they are the foundation on which the legitimacy of the eventual award rests. The UNCITRAL Model Law on International Commercial Arbitration requires that a person approached about a possible appointment disclose any circumstances likely to give rise to justifiable doubts as to their impartiality or independence and that duty continues without interruption from appointment through to the close of proceedings. Institutional rules used across major seats, including the ICC, LCIA and SIAC Rules, mirror this standard, generally applying what courts have described as an objective, reasonable-observer test rather than the arbitrator’s own private sense of fairness. A sole arbitrator who accepts an appointment without first working through this exercise puts the entire proceeding and the eventual enforceability of the award at avoidable risk.
The IBA Guidelines on Conflicts of Interest in International Arbitration, revised in February 2024 for the first time since 2014, remain the most widely consulted soft-law instrument on this subject. The 2024 revision sharpened the General Standards on disclosure and clarified how issues such as third-party funding, sovereign parties and an arbitrator’s wider professional network should be weighed when a potential conflict is assessed. None of this is merely academic: parties increasingly scrutinise an arbitrator’s litigation and advisory history, prior appointments and even public commentary before confirming a nomination, and a sole arbitrator who has not carried out that self-assessment risks a challenge that can derail a case months into the proceedings.
Expertise is the second pillar of a sound appointment. A sole arbitrator is expected to grasp not only the applicable law but the commercial and technical texture of the dispute in front of them, whether that means understanding a force majeure clause in a long-term supply contract or the delay-and-disruption analysis underlying a stalled infrastructure project. Because there is no co-arbitrator to share the analytical burden, gaps in sector knowledge surface quickly, in the quality of procedural directions, in the questions put to expert witnesses and ultimately in the reasoning of the award itself. This is why parties selecting a sole arbitrator for a sector-specific dispute look closely at demonstrated experience in that field, rather than general arbitration credentials alone.
An arbitrator accepting instructions in the energy sector, for instance, needs a working command of production-sharing contracts, power purchase agreements and the regulatory frameworks that shape upstream and downstream disputes; a dedicated energy dispute arbitrator brings that fluency to bear from the first procedural conference. The same holds for commodity trading disputes, where price mechanisms, delivery obligations and force majeure practice under standard-form contracts reward an arbitrator who has actually sat with those instruments before; a seasoned commodity dispute arbitrator is expected to read a documentary letter of credit or a quality-certificate dispute without a lengthy tutorial from counsel. Infrastructure and construction matters raise their own specialised vocabulary, from delay claims under standard-form contracts to multi-party contractual structures, and here too parties look for a construction dispute arbitrator whose experience with EPC contracts and completion-risk allocation shortens the distance between the facts and a well-reasoned award.
The duty to disclose is not a one-time formality discharged at the outset of a case. It is continuing, and it applies throughout the arbitration, not merely at the point of nomination. Courts and institutions have repeatedly emphasised that non-disclosure of a fact that would have justified doubt is itself capable of undermining an award, even where the underlying relationship might, if disclosed, have been accepted by the parties. Guidance from the UK Supreme Court in this area has confirmed that arbitrators sitting on multiple related references involving overlapping parties or facts should, as a general rule, disclose that overlap, reflecting the wider international consensus that transparency, rather than an arbitrator’s private confidence in their own fairness, is what preserves the integrity of the process.
Taken together, these three obligations, independence, expertise and disclosure, define what it means to accept appointment as sole arbitrator responsibly. An arbitrator who declines instructions where a genuine conflict exists, brings demonstrated sector knowledge to the specific dispute, and discloses promptly and completely gives the parties confidence that the process, not merely the outcome, will withstand scrutiny. Parties and counsel evaluating a nomination will find further detail on accepting appointment as sole arbitrator, the roles taken on, and the standard against which every appointment should be measured before consent is given.
